Added get_languages(), detect_language() functions and test cases for th...

*Added the get_languages() function to get a Python list of the supported language locale codes.
*Added detect_language() function to detect the language of the input text.
*Added test cases for both functions - Test cases pass with no failures.
sorry to be choosy about the formatting, but a consistent coding style will be helpful for future contributors:

Can you make this into one line ? `return self.call(url, params)`